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Fisheries acoustic research is conducted from a variety of platforms. The most common is a traditional research vessel, with the echosounders mounted on the ship's hull or in a drop keel. If the vessel does not have permanently installed echosounders, they may be deployed on a pole mount attached to the ship's side, or on a towed body or ...
Acoustic tags are small sound-emitting devices that allow the detection and/or remote tracking of organisms in aquatic ecosystems. Acoustic tags are commonly used to monitor the behavior of fish. Studies can be conducted in lakes, rivers, tributaries, estuaries or at sea.
Like David Starr Jordan before her, Reuben Lasker operates in support of the Southwest Fisheries Science Center in La Jolla, California – a component of NOAA's National Marine Fisheries Service – and primarily conducts surveys of fish, marine mammals, and sea turtles off the United States West Coast and in the eastern tropical Pacific Ocean.
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A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...
Sonar image of the wreck of USS O-9.. The target strength or acoustic size is a measure of the area of a sonar target. This is usually quantified as a number of decibels.For fish such as salmon, the target size varies with the length of the fish and a 5 cm fish could have a target strength of about -50 dB.
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Acoustic signals are the preferred communication tool for researchers who wish to track fish and wildlife in marine habitats in real time. As with radio, acoustic telemetry requires transmitters to send signals and receivers to hear them. The transmitters are electronic tags that emit a series of sound pulses into the surroundings.